| ID |
CVE-2023-46836
|
| Summary |
The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative
Return Stack Overflow) are not IRQ-safe. It was believed that the
mitigations always operated in contexts with IRQs disabled.
However, the original XSA-254 fix for Meltdown (XPTI) deliberately left
interrupts enabled on two entry paths; one unconditionally, and one
conditionally on whether XPTI was active.
As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations
are not active together by default. Therefore, there is a race
condition whereby a malicious PV guest can bypass BTC/SRSO protections
and launch a BTC/SRSO attack against Xen.
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| References |
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| Vulnerable Configurations |
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| CVSS |
| Base: | None |
| Impact: | |
| Exploitability: | |
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| CWE |
NVD-CWE-noinfo |
| CAPEC |
|
| Access |
| Vector | Complexity | Authentication |
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| Impact |
| Confidentiality | Integrity | Availability |
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| Last major update |
11-01-2024 - 17:09 |
| Published |
05-01-2024 - 17:15 |
| Last modified |
11-01-2024 - 17:09 |
